10140421265561 has 2 divisors, whose sum is σ = 10140421265562. Its totient is φ = 10140421265560.

The previous prime is 10140421265539. The next prime is 10140421265573. The reversal of 10140421265561 is 16556212404101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8316192855961 + 1824228409600 = 2883781^2 + 1350640^2 .

It is a cyclic number.

It is not a de Polignac number, because 10140421265561 - 2²⁶ = 10140354156697 is a prime.

It is not a weakly prime, because it can be changed into another prime (10140421265761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5070210632780 + 5070210632781.

It is an arithmetic number, because the mean of its divisors is an integer number (5070210632781).

Almost surely, 2^{10140421265561} is an apocalyptic number.

It is an amenable number.

10140421265561 is a deficient number, since it is larger than the sum of its proper divisors (1).

10140421265561 is an equidigital number, since it uses as much as digits as its factorization.

10140421265561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57600, while the sum is 38.

Adding to 10140421265561 its reverse (16556212404101), we get a palindrome (26696633669662).

The spelling of 10140421265561 in words is "ten trillion, one hundred forty billion, four hundred twenty-one million, two hundred sixty-five thousand, five hundred sixty-one".